cred: use correct cred accessor with regards to rcu read lock

Commit "userns: Convert setting and getting uid and gid system calls to use
kuid and kgid has modified the accessors in wait_task_continued() and
wait_task_stopped() to use __task_cred() instead of task_uid().

__task_cred() assumes that we're inside a rcu read lock, which is untrue
for these two functions.

Modify it to use task_uid() instead.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 789e3c5777f7..910a0716e17a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1427,7 +1427,7 @@ static int wait_task_stopped(struct wait_opts *wo,
         if (!unlikely(wo->wo_flags & WNOWAIT))
                 *p_code = 0;
 
-        uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
+        uid = from_kuid_munged(current_user_ns(), task_uid(p));
 unlock_sig:
         spin_unlock_irq(&p->sighand->siglock);
         if (!exit_code)
@@ -1500,7 +1500,7 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
         }
         if (!unlikely(wo->wo_flags & WNOWAIT))
                 p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
-        uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
+        uid = from_kuid_munged(current_user_ns(), task_uid(p));
         spin_unlock_irq(&p->sighand->siglock);
 
         pid = task_pid_vnr(p);